Which type of evidence is exemplified by small samples like a strand of hair or a drop of blood?

Which type of evidence is exemplified by small samples like a strand of hair or a drop of blood?

• A. Trace
• B. Physical
• C. Biological
• D. Class

Answer: (A)

Trace evidence describes tiny materials that can link a person, object, or location to an event, even when only a small amount is recovered. A strand of hair or a drop of blood fits this idea perfectly because both are small samples that can be left behind or collected from a scene and then analyzed—often for DNA, but also for other identifying details. The value of trace evidence lies in its ability to transfer and be recovered in minute quantities, making careful collection and analysis essential. Physical evidence is a broad category that includes tangible items of any size, so it’s less precise about the defining attribute here. Biological evidence refers to the material’s nature (hair, blood, saliva) rather than the small quantity. Class evidence speaks to characteristics that place evidence into a group rather than linking to a specific individual. The emphasis with small samples like hair and blood is their status as trace evidence—the tiny remnants that can still yield meaningful connections.

Trace evidence describes tiny materials that can link a person, object, or location to an event, even when only a small amount is recovered. A strand of hair or a drop of blood fits this idea perfectly because both are small samples that can be left behind or collected from a scene and then analyzed—often for DNA, but also for other identifying details. The value of trace evidence lies in its ability to transfer and be recovered in minute quantities, making careful collection and analysis essential.

Physical evidence is a broad category that includes tangible items of any size, so it’s less precise about the defining attribute here. Biological evidence refers to the material’s nature (hair, blood, saliva) rather than the small quantity. Class evidence speaks to characteristics that place evidence into a group rather than linking to a specific individual. The emphasis with small samples like hair and blood is their status as trace evidence—the tiny remnants that can still yield meaningful connections.